I knew a gardener who use the beneficial nematodes on irises. She used a syringe to infect the plants.
I have been buying wholesale from QandZ since the mid 90's, and I grow the tissue culture plants for two years before I sell them. TC will die if not protected from temperatures below 40°, therefore, I allow them to go dormant in the fall until mid October. Depending on how much space I need, I choose the location from the following:
1 Cold greenhouse where temperature will never be below 40° and the plants will come pout dormancy sometime in March, and they will be taken out to a very protected area in late May.
2 Craw space in heavy, black trash bags, where the temperature is never below 50°, and these will go out when the craw space temperature reaches a constant 65°. At this point the outdoors temperature should be constant 50° plus, and the hostas grow at nature's speed.
3 The refrigerator if I have some dwarf or miniature hostas that I want to emerge in January for my pleasure.
